How to prepare the requirements for your software project

Why requirements matter

Most problems in a software project don't come from the code, but from something that wasn't said in time: a business rule everyone assumed was obvious, a type of user no one mentioned, or an integration that showed up halfway through. Preparing requirements is how you put all of that on the table before work begins.

You don't need to know technology or write a technical document. A good brief is a clear description of what you want to achieve, for whom, and how you work today. With that, the development team can propose solutions, estimate more accurately and spot risks early. This guide shows you how to put it together step by step.

Start with goals and users

Before thinking about screens or features, answer why the project exists. A useful goal describes a business outcome, not a tool. “We want an app” is not a goal; “we want sales reps to take orders during the visit instead of back at the office” is.

Next, list who will use the system. For each type of user, write down:

• What they do day to day and which part of it the system will touch.
• Where they work: office, warehouse, on the road, at home; computer or phone; with or without a good connection.
• What they can and can't see. Permissions usually matter more than they seem.
• What frustrates them today. Your team's complaints are one of the best sources of requirements.

Describe your current processes

Explain how the work the system will cover gets done today, step by step and with real examples. It doesn't matter whether the process lives in spreadsheets, messages or on paper: understanding the starting point is the best way to design the destination.

1. What starts the process? A call, an order, a date, an alert.
2. Who is involved in each step, and what information do they need?
3. Where are the approvals, exceptions or special rules?
4. Which documents or reports come out at the end?
5. Which other systems or services exchange information with it?

Share examples too: a form your team uses, a screenshot of the tracking spreadsheet, a report put together every month. One concrete example clarifies more than several paragraphs of description.

Turn needs into user stories

A user story is a simple way to describe a need from the point of view of the person who has it. It follows this structure:

As a [type of user], I want to [do something], so that [I get a benefit].

For example: “As a sales rep, I want to check a product's stock from my phone, so that I can confirm to the customer right away whether we can fill their order.”

Add acceptance criteria to each story: the concrete conditions that must be met for it to be considered done. They are the basis for testing and prevent misunderstandings when the work is reviewed.

• The stock shown matches the warehouse assigned to the sales rep.
• If there is no stock, the expected date of the next delivery is shown, if any.
• The lookup works from the phone's browser.

Prioritize with the MoSCoW method

Almost every project starts with more ideas than fit in a first phase. Prioritizing doesn't mean throwing ideas away, but deciding what comes first. The MoSCoW method sorts each requirement into four groups:

The “must haves” define your first version; read more about that approach in what an MVP is. Clear priorities also make it easier to compare proposals and understand what drives custom software cost. And if you are evaluating vendors, see how to choose a software development company.

Common mistakes when preparing requirements

When we review project briefs, we often see the same stumbles. Avoiding them saves you conversations and rework later on:

• Describing the solution instead of the problem. “We need a button that exports to Excel” sometimes hides the real need: someone builds a report by hand every week. Explaining the problem opens the door to better solutions.
• Leaving out the edge cases. Returns, cancellations, customers with special credit terms: they are few, but they tend to hold the most complicated rules.
• Talking only to management. The people who run the process know details that don't appear in any manual.
• Wanting everything in the first version. Without priorities, every idea weighs the same and the project grows out of control.
• Treating the document as final. Requirements get refined as the team understands your operation better; what matters is agreeing on how changes are handled.